Thomas Lopez of ZBS, an American outfit specialising in making audio drama, has just finished a set of 50 "2 Minute Film Noirs".

They're very high quality and highly entertaining, conjuring up rainy streets, neon signs and dames who aren't quite what they appear.

Here are a few as an appetiser:
http://www.zbs.org/Film_Noir_for_Blogs/01%20Chez%20Tootsie.mp3

http://www.zbs.org/Film_Noir_for_Blogs/03%20Barking%20Guns%20&%20Dancing...

http://www.zbs.org/Film_Noir_for_Blogs/04%20A%20Big%20Sack%20of%20Wind.m...